4 Answers

Not sure if you have solved this youself, but here is the answer that I found.

I do not believe that this is possible with the latest version of XCTU as it does not seem possible to connect to the device and get into terminal mode.

You need to get the older V5.2.8 version of XCTU.
1. Set the communications parameters up to connect to the right serial port.
2. Select the terminal tab
At the top check DTR and Break, but leave RTS unchecked
3. Reset the Xbee module
4. Uncheck Break
5. Move cursor into terminal window and hit <CR>
6. This should now display the bootloader menu
7. Press 'F'
8. Terminal will start to display a sequence of 'C' characters
9 Select Xmodem from the menu
10. Select your .bin file and click send